Johnson-level-tool-mfg RAS-1 Manuale Utente Scaricare il pdf (Pagina 16)

building.Nowlineupthedashedline(abovethe80°incre-

mentonthesquare)withtheplumbmark(seeFigure7A&7B).

Draw the horizontal seat mark, a perpendicular line, along

the bottom of square. Never notch more than halfway

through the rafter and make all seat notches the same

depth.

STEP 3. TAIL OR BOTTOM PLUMB CUT: Using your tail

length(2'1-3/8"inourexample),measuredowntherafter

from the seat plumb line and mark the bottom plumb line

FIG. 7A

Seat Notch or

Bird’s Mouth Layout.

FIG. 7B

Seat Notch or

Bird’s Mouth Layout.

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Johnson-level-tool-mfg RAS-1 Manuale Utente Pagina 16